Using PAS with HTTP Header variable in dual-host load balanc environment

[Former Member]

We have a system that we are installing where the ITS Instances are configured to have 2 Wgate servers, and 2 Agate servers. We have each Wgate Instance point to the corresponding Agate Instances on the Agate servers for the same Instances. That is, HTTP Server for Wgate

Instance IT1, load balances across both Agate servers on which the same Agate Instance IT1 is installed. So we have a fan out situation. We repeat the same situation on our second Wgate server so we have failover and load balancing configured.

The problem I have run into is the use of the PAS. When configuring this service (saphttp or sapntauth (we renamed)) it asks for a redirect host. When we had single host ITS Instances this was not a problem. We would just set this to the same host with the proper port. Now that

we have load balancing, what value do we set this to? If we have a request come into Wgate 1 Instance IT1 that goes to Agate Server 2 Instance IT1 because Agate Server 1 is down, our system doesn't work if we had set the redirectHost on Agate Server 2 Instance IT1 saphttp

service to swgs2. But, if we set all of the redirecthosts to swgs1 we don't have any redundancy. Please respond as quickly as possible.

[Strehle]

Hi,

PAS does not support such requirements. You have solve this via a ReverseProxy or a WebDispatcher.

In your DNS you can also set one alias name to different IP adresses.

regards,

-markus

[Former Member]

Hi Markus, thanks for the reply. We do use reverse proxies, these are the systems which feed the ITS Wgate (webserver) servers and supply the username (UN) in the HTTP header. How do I configure PAS in this environment to work then? I can't do a web dispatcher.

We are currently using a single host configuration with the reverse proxy. The problem is, what do I set the redirecthost value to in the sapntauth (PAS) service for the dual host config?

Thanks.

Message was edited by: Thomas Stockli

Message was edited by: Thomas Stockli

[Former Member]

I figured it out. Thanks!